Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients

Definitions

• A is selected from the group consisting of:
• R is selected from the group consisting of hydrogen, halogen, nitro and trifluorornethyl; R is selected from the group consisting of hydrogen, lower alkyl, lower alkanoyloxy and R is selected from the group consisting of hydrogen, hydroxy, lower alkoxy, and lower alkanoyloxy; R is selected from the group consisting of hydrogen and lower alkyl; R is selected from the group consisting of halogen, hydroxy, lower alkoxy, alkyl amino, and thioalkyl; R and R are selected from the group consisting of hydrogen and lower alkyl and R and R together with their attached nitrogen atom form a 5 or 6 membered heterocyclic ring; R and R are lower alkyl; n is an integer from 2 to 5 with the proviso that when R is selected from the group consisting of lower alkoxy, lower alkanoyloxy, and hydroxy, A is:
• the 5-(2,6-disubstituted phenyl) benzodiazepines and benzodiazepin-Z- ones compounds of Formula I and I-A above, are highly activate as sedatives, psychosedatives, muscle relaxants, hypnotics and anticonvulsants.
• the acid addition salts of the novel medicinally valuable 1,4-benzodiazepines and benzodiazepin-2-ones of Formula I, I-A and I-B above are included within the purview of the present invention. More particularly, the compounds of Formulae I, I-A and I-B above, form acid addition salts with pharmaceutically acceptable organic and inorganic acids, such as hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, acetic acid, formic acid, succinic acid, maleic acid, p-toluene sulfonic acid, and the like.
• pharmaceutically acceptable organic and inorganic acids such as hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, acetic acid, formic acid, succinic acid, maleic acid, p-toluene sulfonic acid, and the like.
• lower alkyl includes both straight and branched chain alkyl groups having from 1 to 7 carbon atoms, such as methyl, ethyl, propyl, isopropyl, and the like.
• lower alkoxy refers to both straight and branched chain alkoxy radicals containing from 1 to 7 carbon atoms, such as ethoxy, methoxy, butoxy, etc.
• lower alkanoyloxy refers to both straight chain and branched chain aliphatic carboxylic acid moieties containing from 2 to 7 carbon atoms such as acetoxy, propionyloxy, butryryloxy and the like.
• halogen includes bromine, chlorine, fluorine, and iodine.
• alkyl amino included monoalkyl amino radicals such as methylamino, ethylamino, and di-alkyl amino radicals such as di-methylamino, di-ethylamino, etc.
• benzodiazepines and benzodiazepin-Z-ones of Formula I above of this invention are those compounds wherein A is:
• the preferred benzodiazepines of Formula I-A above are those compounds wherein A is:
• R is a substituent in the 7 position and is either halogen, trifiuoromethyl, or nitro.
• the preferred halogens are chlorine and bromine.
• R is a lower alkyl radical
• the preferred radical is methyl.
• R is a lower alkanoyloxy radical
• the preferred radical is acetoxy.
• R is preferably hydrogen.
• the symbolic grouping CnH n represents straight or branched chain alkyl groups containing 2 or more carbon atoms between the nitrogen atoms joined thereby, such as ethylene, propylene, isopropylene, butylene and the like.
• n is either 2 or 3.
• R is halogen
• the preferred halogen is either chlorine or fluorine.
• R is a lower alkoxy radical
• the preferred radicals are methoxy and ethoxy.
• R and R are preferably hydrogen, lower alkyl radicals, such as methyl or ethyl, or heterocyclic radicals which form with their attached nitrogen above, a pyrrolidino or piperidino ring.
• the benzodiazepines and benzodiazepin-Z-ones of Formula I, I-A and 1-3 above, which have a 2,6-disubstituted phenyl group in the 5-position demonstrate a high degree of activity and are useful as sedatives, muscle relaxants, anticonvulsants, hypnotics, and psychosedatives. This is surprising in view of the fact that the corresponding position isomeric compounds having radicalssubstituted on the 2 and 4-position of the S-phenyl ring demonstrate no useful activity.
• the compounds of Formulae I and I-A above, as well as their pharmaceutically acceptable acid addition salts are used in the form of conventional pharmaceutical preparations which contain said compounds in connection with conventional pharmaceutical organic or inorganic materials suitable for internal administration.
• compositions containing the compounds of Formulae I, I-A and I-B as well as their pharmaceutically acceptable acid additions salts can be administered parenterally or orally. Dosages can be adjusted to individual requirements, for example, these compounds can be administered in dosages of from about 0.01 mg. kg. to about 10.0 mg./kg. per day. These dosages can be administered in a single dosage form or in divided dosage forms.
• the pharmaceutical compositions can contain conventional organic or inorganic inert carrier materials, such as water, gelatin, lactose, starch, magnesium sterate, talc, vegetable oils, gums, polyalkylene glycols, Vaseline or the like.
• the pharmaceutical preparations can be in conventional solid dosage forms such as tablets, dragees, suppositories, capsules or in conventional liquid dosage forms such as solutions, suspensions or emulsions.
• the pharmaceutial compositions can be submitted to conventional pharmaceutical expedient such as sterilization and/ or can contain pharmaceutical additives such as preservatives, stabilizing agents, wetting agents, emulsifying agents, salts for adjusting the osmotic pressure, buffers or the like. They also can contain other therapeutically useful materials.
• the compounds of Formulae I, I-A and I-B are extremely effective and active as sedatives and muscle relaxants. This can be seen by the fact that dosages of from below 10 to mg./kg. and above administered orally to cats produce muscle relaxation.
• compounds such as 7-chloro-5-(2,6-difluorophenyl)-1-methyl- 1,3-dihydro-2H-1,4-benzodiazepin-2-one; 5-(2,6 difluorophenyl)-1, 3-dimethyl 7 nitro 1,3 dihydro-2H-1,4- benzodiazepin-Z-one and 7-chloro-5-(2,6-difiuorophenyl)- 1,3-dihydro-2H-1,4-benzodiazepin-2-0ne 4-oxide have minimum effective doses of 0.01 mg./kg., 0.1 mg./kg. and 0.5 mg./kg., respectively as measured by the unanesthesized cat test whereas the minimum effective dose of meprobamate,
• a compound such as 7-nitro-5-(2,5-difluorophenyl) 1 methyl 1,3-dihydro-2H-1,4-benzodiazepin-Z-one and a compound such as 5-(2,6-difluorophenyl)-l,3 dihydro 7 nitro-2H-1,4-benzodiazepin- 2-one have PD of 0.50 mg./kg. po. and 0.25 mg./kg. p.o. respectively as measured by the inclined screen test in mice (Behren, Arch. Expt. Path and Pharm. :237, 1929) whereas a common muscle relaxant and sedative such as meprobamate has PD of 256 mg./kg. p.o. as measured by the same test.
• the uanesthesized cat test utilized to determine the sedative and muscle relaxant activity of a compound is performed by treating cats orally with the compound to be tested and observing the minimum dose of the compound necessary to produce ataxia.
• the compounds of Formulae I and I-A are extremely effective as anticonvulsants and sedatives. This can be seen by the fact that when dosages of 10 mg./kg. as above, of the compounds of Formulae I and I-A are administered orally to mice, the mice are protected from convulsions and death caused by administration of metrazol by the method set forth in Proc. Soc. Exp. Med. and Bio. 57,261, 1944. For example, using this method, the ED.
• the compound of Formula III can be converted to the compound of Formula II by any one of two methods outlined in the following reaction scheme:
• the compound of Formula III is converted into the dihalo benzoic acid compound of Formula IV, as in reaction step (a), by treating an organo metallic salt of the compound of Formula III above, with carbon dioxide.
• organo metallic salts which can be utilized in accordance with this invention include lithium metadifluorobenzene, lithium metadichlorobenzene, sodium metadichlorobenzene, etc.
• the reaction of step (a) is carried out by treating the compound of Formula III in the form of an organo metallic salt with carbon dioxide.
• the carbon dioxide can be bubbled into the reaction medium or can be added in the form of Dry Ice. In carrying out this reaction, temperature and pressure are not critical and the reaction can be carried out at room temperature or higher.
• This reaction is preferably carried out in the presence of an inert organic solvent.
• Any conventional inert organic solvent can be utilized.
• ethers such as tetrahydrofuran, diethyl ether and the like.
• the dihalo benzoic acid compounds of Formula 1V above are converted into the acid chloride compounds of Formula V above, by means of treating this dihalo benzoic acid compound with a conventional acid chlorinating agent such as thionyl chloride.
• a conventional acid chlorinating agent such as thionyl chloride.
• the reaction of step (b) is carried out by utilizing conventional and well-known techniques.
• the compound of Formula V above is converted into the benzophenone compound of Formula II above, where R in Formula H above, is in the 5-position by means of reacting the compound of Formula V with the para substituted aniline derivative of Formula VI above, under Friedel Crafts Conditions.
• a catalyst such as zinc chloride is utilized. This reaction is carried out by utilizing temperatures of from about C. to 220 C. without any solvent being present.
• the resulting product is then subjected to hydrolysis in an aqueous acid solution to give the compound of Formula II above, wherein R is in the 5-position. Any of the conventional conditions utilized in acid hydrolysis can be used in carrying out this portion of the reaction.
• Another means of preparing the benzophenone compounds of Formula II above, from the organo metallic salts of the compounds of Formula III above, is by first reacting the organo metallic salts of the compounds of Formula III above, with a 2-methyl-3,1-benzoxazin-4-one compound of Formula VIII above, to form the benzoylacetanilide compound of Formula VII above.
• Thecom pound of Formula VIII above can be unsubstituted or substituted with a halo group or a trifluoromethyl group in any position.
• Any of the organo metallic compounds of Formula III above, which were used in step (a) can be utilized in the reaction of step (d). In carrying out the reaction of step (d), the same conditions that were utilized in connection with step (a) can be utilized.
• the benzoylacetanilide compound of Formula VII above is converted to the benzophenone of Formula II above, as in step (e) by treating the compound of Formula VII above with a hydrolyzing agent such as a mineral acid. Any conventional acid hydrolyzing agent and acid hydrolyzing conditions can be utilized in carrying out the reaction of step (e). In this manner a compound of Formula II above, is produced wherein R is substituted on either the 3, 4, 5 or 6-position.
• the 2-amino-2',6'-dihalobenzophenone compound of Formula II can, if desired, be converted into the corresponding mono-halo compound with one of its halogen groups replaced by an alkoxy radical, an alkyl amino radical, an alkyl thio radical, or a hydroxy radical so that a compound can be produced having the formula:
• X and R are as above and R is a lower alkyl
• R is carried out by reacting compounds of the Formula II above, with an alkali metal lower alkyl mercaptan.
• an alkali metal lower alkyl mercaptan is carried out in the presence of an inert organic solvent.
• Any conventional organic solvent can be utilized in carrying out this reaction.
• Typical inert organic solvents which can be utilized include methylcellosolve, ethanol, methanol, dichloromethane, hexane, benzene, etc.
• any alkali metal lower alkyl mercaptan can be utilized to replace the halo group on the 2-position of the benzophenone compound of Formula II above, with an alkyl thio group.
• alkali metal lower alkyl mercaptans are included sodium methyl mercaptan, sodium ethyl mercaptan, potassium-isopropyl mercaptan, lithium methyl mercaptan, etc.
• temperature and pressure are not critical and this reaction can be carried out at room temperature and at atmospheric pressure or at elevated temperatures and pressures. Generally, it is preferred to carry out this reaction at elevated temperatures such as the reflux temperature of the solvent which can be from 90 C. to 140 C., depending upon the solvent.
• R and X are as above, and R and R are lower alkyl groups, is carried out by reacting componds of the Formula II above with a lower alkyl amine, such as a monoalkyl amine or a dialkyl amine.
• a lower alkyl amine such as a monoalkyl amine or a dialkyl amine.
• a lower alkyl amine such as a monoalkyl amine or a dialkyl amine.
• Typical lower alkyl amines which can be utilized in accordance with this invention are included N-methyl-N-ethyl amine, dimethyl-amine, N-propyl-N-ethyl-amine, methyl-amine, ethyl-amine, diethyl-amine, etc.
• Typical organic solvents which can be utilized include any of the aforementioned organic solvents.
• Among the preferred organic solvents are included ethanol, propanol, methanol, diethyl ether, etc.
• temperature and pressure are not critical and this reaction can be carried out at room temperature and atmospheric pressure or at elevated temperatures and pressures. Generally, it is preferred to carry out this reaction at elevated temperatures which can be from about 90 C. to 140 C. and at pressures of from about 1 to 10 atmospheres.
• elevated temperatures can be from about 90 C. to 140 C. and at pressures of from about 1 to 10 atmospheres.
• R and X are as above, and R is lower alkyl
• any conventional alkali metal lower alkoxide can be utilized to selectively replace the halo group on the 2'-position of the aminobenzophenone compound of Formula II above.
• the preferred alkali metal alkoxides are included sodium methoxide, sodium ethoxide, potassium ethoxide, and lithium propoxide.
• Any conventional inert organic solvent such as the solvents hereinbefore mentioned can be utilized in carrying out this reaction.
• the preferred solvents which can be utilized in this reaction are included methanol, ethanol, diethyl ether, etc.
• temperature and pressure are not critical and this reaction can be carried out at room tempeerature and at atmospheric pressure or at elevated tem peratures and pressures. Generally, it is preferred to carry out this reaction at elevated temperatures such as the reflux temperature of the solvent, which can be from about C. to C. depending upon the solvent.
• the reaction medium is heated to its reflux temperature.
• R in compounds of the Formula IX is a halo radical, the compound has the formula:
• the S-halo radical can be easily removed therefrom by hydrogenating the compound of Formula IX-E above.
• the hydrogenation is carried out by treating the compound of Formula IX-E with hydrogen gas in the presence of a palladium hydrogenation catalyst such as palladium on carbon.
• a palladium hydrogenation catalyst such as palladium on carbon.
• temperature and pressure are not critical and the reaction can be carried out at room temperature or at elevated pressures and temperatures.
• R, R R X and X are as above.
• the compounds of Formula XIA are useful as hypnotics psychosedatives, sedatives, anticonvulsants and muscle relaxants. These compounds of Formula XI-A can be used in the same manner and dosage levels as hereinbefore described for the compounds of Formulae I and IA.
• the compound of Formula XI-A can be cyclized to form compounds corresponding to Formula X above.
• the compound of Formula XI-A can be dissolved in an inert organic solvent such as in any of the solvents hereinbefore mentioned and then heated under reflux, i.e. from 60 C. to C. depending upon the solvent, until cyclization is effected.
• the compounds of Formula X above can also be prepared directly from the compounds of Formula 1X above, via reaction with an u-amino acid.
• the a-amino acid utilized is glycine.
• the reaction, i.e., of the compound of Formula IX above with an a-amino acid, is carried outwith an a-amino acid ester hydrochloride, for example, a lower alkyl eser of an a-amino acid.
• R in compounds of Formula X above is hydrogen
• the compound of Formula IX above can be reacted either with glycine or glycine ethyl ester hydrochloride to obtain a compound corresponding to Formula X above.
• R in compounds of Formula X above is a lower alkyl
• Typical a-amino acids used in this process are for example, alanine, valine, and the like.
• the above reactions, both where R is a hydrogen and is a lower alkyl are preferably affected in a solvent such as pyridine, dimethyl formamide, and the like. It is also preferable to utilize one of the materials, or a fraction thereof, present in the form of the salt of a strong organic or inorganic acid, such as glycine hydrochloride, glycine ethyl ester hydrochloride, and pyridine hydrochloride.
• temperature and pressure are not critical and the reaction can be carried out at room temperature and atmospheric pressure and at elevated temperatures and pressures.
• this compound when in Formula X above, R is hydrogen, this compound can be converted to the corresponding nitro compound by treating the last mentioned compound with an alkali metal nitrate or nitric acid in the presence of a mineral acid such as sulfuric acid.
• Typical alkali metal nitrates which can be utilized include sodium nitrate, potassium nitrate, etc.
• the inorganic acid in carrying out this reaction is preferably utilized as the reaction media. In carrying out this reaction, temperature and pressure are not critical and this reaction can be carried out at room temperature or at elevated or reduced temperatures. Generally, it is preferred to carry out this reaction at a temperature of from about 10 C. to about 40 C. In this manner, compounds of the formula:
• R, R R and X are as above, can be prepared from compounds of the Formula IX.
• the benzodiazepine compound of Formula X can be 11 converted to the various compounds by means of the following reaction scheme:
• R, R R R R R R and X are as above, and R" is lower alkanoyl and R'" is lower alkanyloxy.
• compounds of the formula X-A can be converted to compounds of the Formula XIV above, as in reaction (3'), by means of treating the compounds of Formula X-A above, with a suitable alkylating agent, preferably after first affecting the conversion thereof to the l-sodio derivative, with, for example, a sodium alkoxide, e.g., sodium methoxide, or an alkali metal hydride, such as sodium hydride.
• a sodium alkoxide e.g., sodium methoxide
• an alkali metal hydride such as sodium hydride.
• dilower alkyl sulfate such as dimethyl sulfate, diethyl sulfate, etc.
• R in compounds of the For mula XIV above is a nitro radical
• the compound of Formula XIV above is chemically reduced to the compound of Formula XV above.
• a reducing agent such as dimethyl amino borane in an organic lower aliphatic acid solvent such as glacial acetic acid.
• temperature and pressure are not critical. Generally it is preferred to use room temperature in carrying out this reaction.
• the dihydrobenzodiazepin 2-one compounds of Formula X-A above can be directly converted into the tetrahydro-benzodiazepin-2-one compound of Formula XIII as in step (h), by means of hydrogenating the compound of Formula X-A above. This hydrogenation can be carried out in the same manner as recited in step (k).
• the conversion of the compounds of Formula XIII above, into the compounds of Formula XV above, can be carried out, as in step (1) by treating the compound of Formula XIII above with an alkylating agent. This alkylating reaction can be carried out in the same manner as described in connection with step (j).
• Compounds of the Formula X-A above can be converted into compounds of the Formula XVI above, as in step (n), by means of oxidizing the compound of the Formula X-A above with an organic peracid.
• a conventional organic peracid such as peracetic acid, perpropionic acid, etc. can be utilized in carrying out this reaction.
• the oxidation can be eifected at room temperature, or above or below room temperature. Also, in this manner, compounds of the Formula XIV above, can be oxidized to their corresponding N-oxides.
• Compounds of Formula XII can, if desired, be converted to the corresponding 4-N-oxides via oxidation as in step (11).
• an acyl protecting group for example, a lower alkanoyl e.g. formyl or acetyl radical prior to oxidation as in step (n).
• the acyl protecting group can be removed from this nitrogen atom after oxidation to the N-oxide is completed, if desired, to form compounds of Formula I above, wherein R is hydrogen by hydrolysis.
• This hydrolysis is suitably eiIected in the presence of a molar equivalent of alkali, advantageously at room temperature. However temperatures up to 30 C. can be utilized.
• the compounds of Formula XVI above can be con verted into the compounds of Formula XVII above, as in step by treating the compounds of Formula XVI above, with an amino compound selected from the group consisting of ammonia, primary lower alkyl amines, and heterocyclic amino compounds, such as pyrrolidine and piperidine, and secondary lower alkyl amines, in the presence of a Lewis acid catalyst.
• an amino compound selected from the group consisting of ammonia, primary lower alkyl amines, and heterocyclic amino compounds, such as pyrrolidine and piperidine, and secondary lower alkyl amines
• a Lewis acid catalyst can be utilized.
• a typical catalyst which may be utilized in carrying out this reaction is titanium tetrachloride.
• the preferred amino compounds which can be utilized in accordance with this invention are included, methylamine, diethylamine, N,N-methylethylamine, pyrrolidine and piperidine.
• the conversion of compounds of the Formula XVI into compounds of the Formula XVII is carried out in the presence of an inert organic solvent.
• Any conventional inert organic solvents can be utilized in carrying out this reaction.
• Typical inert organic solvents which can be utilized in accordance with this invention include diethyl ether, tetrahydrofuran, benzene, hexane, pentane, etc.
• temperature and pressure are not critical and this reaction can be eifected at room temperature or below, and at atmospheric pressure or at elevated temperatures and/or elevated pressures.
• the compounds XVII by treating the compounds XVII with phosphorus trichloride in an inert organic solvent media. Any conventional inert organic solvent can be utilized to carry out this conversion. Among the preferred solvents which can be utilized are included chloroform or benzene. In carrying out this reaction, it is preferred to utilize elevated temperature, preferably the reflux temperature of the solvent.
• the compound of Formula XVII-A above can be hydrogenated to reduce the double bond in the 4- and 5-positions to a single bond. This is carried out by treating the compound of Formula XVII-A, above with hydrogen gas in the presence of Raney nickel catalyst. This reaction is carried out in an organic alcohol solvent medium such as, methanol, ethanol, etc. This reaction can be carried out at room temperature. However, temperatures above and below room temperature can be utilized.
• step (q) The conversion of compounds of the Formula XVI above, into compounds of the Formulae XVIII and XIX above, is carried out as in step (q), by treating the compound of the Formula XVI above, with an anhydride of a lower alkanoic acid such as acetic acid, propionic acid, etc. Furthermore, this reaction is carried out utilizing the lower alkanoic acid anhydride as the solvent medium.
• temperature and pressure are not critical and the reaction of step (q) can be carried out at room temperature and atmospheric pressure or at elevated temperatures and pressures. Generally, it is preferred to carry out this reaction at temperatures of from about 40 C. to C.
• Compounds of Formula XVIII above can be converted to the compound of Formula XX by any conventional hydrolysis procedure such as by treating the compounds of Formula XVIII above, with an alkali metal hydroxide eg sodium hydroxide or an alkaline earth metal hydroxide or a mineral acid.
• an alkali metal hydroxide eg sodium hydroxide or an alkaline earth metal hydroxide or a mineral acid.
• N-oxide compound of Formula XVII above can be converted into the corresponding 4-desoxy compound, wherein the hydrogen in position 3 is replaced by a lower alkanoyloxy group by means of treating the compound of Formula XVII above, in the manner of step (p).
• This resultant compound can, if desired, be converted into the corresponding compound wherein the lower alkanoyloxy compound is replaced by a hydroxy 15 group by means of treatment with a hydrolyzing agent as described with respect to step (q).
• the corresponding N-oxide of Formula XII above can be converted into a compound of Formula XII wherein the hydrogen in position 3 is replaced by a lower alkanoyloxy group by means of treating the N-oxide in the manner of step (p).
• This compound can be, if desired, converted into the corresponding compound wherein the lower alkanoyloxy group is replaced by a hydroxy group by treatment in the manner of step (q).
• A, B, n, R R R and R are as above, can be prepared from their corresponding benzodiazepiues and benzoidazepin-Z-ones of Formula I above, wherein R is hydrogen by reaction of these compounds, preferably after first elfecting the conversion of the l-unsubstituted cmopounds of Formula I above, to their l-sodio derivatives, with an amino lower alkyl halide of the formula:
• n, R and R are as above, and X is a halogen atom selected from the group consisting of chlorine, bromine and iodine.
• Another means of preparing the compound of Formula XXI above, from the compound of corresponding benzodiazepines and benzodiazepin-Z-ones of Formula I, wherein R is hydrogen is by first reacting the compounds of Formula I, preferably after first effecting their conversion of the l-unsubstituted compounds of Formula I above, to their l-sodio derivatives with a compound of the formula:
• n and X are as above and X is selected from the group consisting of chlorine, bromine and iodine.
• This reaction product is converted to the compound of Formula XXI above, by reacting this reaction product with an amino compound of the formula:
• the N-substituted-aniline of the Formula XXII is converted to the compound of Formula XXIII by treating the compound of Formula XXII with ethyleneimine in the presence of an aprotic Lewis acid, such as, for example, boron trifluoride, titanium tetrachloride, aluminum chloride, and the like (preferentially aluminum chloride), with an inert organic solvent.
• an aprotic Lewis acid such as, for example, boron trifluoride, titanium tetrachloride, aluminum chloride, and the like (preferentially aluminum chloride
• an inert organic solvent include benzene, toluene and the like. While temperature is not a critical aspect of this reaction, elevated temperatures are preferred. Generally, it is preferred to utilize the reflux temperature of the reaction medium.
• X can be any suitable halo group. In the most advantageous aspects, X is selected from the group consisting of chlorine or bromine.
• the reaction of step (s) can, if desired, be carried out in the presence of an acid acceptor. If an acid acceptor is utilized, an excess of acid acceptor can be provided whereby it can also serve as the medium in which the reaction is effected. Any suitable acid acceptor which will function efiicaciously for the purposes of the present invention is contemplated. Especially preferred are tertiary amines e.g. pyridine and the like. On the other hand, this reaction can be preferably carried out in an inert organic solvent without having an acid acceptor present.
• organic solvents usable in this preferred process include, aromatic hydrocarbons such as benzene, toluene and the like, halogenated aromatic hydrocarbons such as chlorobenzene or the like, and any other suitable inert organic solvent.
• aromatic hydrocarbons such as benzene, toluene and the like
• halogenated aromatic hydrocarbons such as chlorobenzene or the like
• any other suitable inert organic solvent any other suitable inert organic solvent.
• step (t) the compound of Formula XXIV above, is cyclized to the compounds of Formula XXV above.
• This cyclization can be effected with any conventional dehydrating agent.
• dehydrating agents suitable for the purpose of the present invention may be included phosphorous pentoxide, phosphorus oxychloride, polyphosphoric acid, and the like, and mixtures thereof.
• a dehydrating system comprising essentially phosphorus oxy-chloride and phosphorus pentoxide are employed preferably containing the former in a molar amount greater than 50 percent of the total molar amount of these two ingredients.
• it is preferred to carry out the dehydration reaction at a temperature range of from 50 C. to about 120 C.
• the benzodiazepines of Formula XXV can be converted to the benzodiazepin-2ones of Formula XXVI above, by means of oxidation.
• any conventional oxidizing agent can be utilized.
• Preferred oxidizing agents are those formed from chrmium and manganese in combination with oxygen at their higher valences, for example, chromic acid or the permanganate ion.
• temperature and pressure are not critical and this reaction can be carried out at room temperature and atmospheric pressure. On the other hand, elevated temperatures such as the reflux temperature of the reaction medium can be utilized.
• the first organic solvent was added in an amount just sufiicient to dissolve the material and the second organic solvent was added in an amount just sufficient to form a cloudy mixture. After both solvents were added, the entire mixture was cooled so as to initiate crystallization.
• EXAMPLE 1 4'-chloro-2'-(2,6-difluorobenzoyl)acetanilide
• a solution of 114 g. (1 mole) of m-difluorobenzene in 130 ml. of dry tetrahydrofuran was added dropwise to a commercial solution of 1 mole of N-butyl lithium in hexane, at 70. The solution was stirred at this temperature for 45 minutes and then added to a solution of 185 g. (0.944 mole) of 6-chloro-2-methyl-3,l-benzoxazin- 4-one in 1.5 liters of dry tetrahydrofuran also at 70.
• reaction mixture was stirred at this temperature for 1 hour and then 3 N hydrochloric acid was added until pH was reached.
• the reaction mixture was then evaporated to dryness, 1 liter of water was added and the mixture was extracted with dichloromethane (3X 250 ml.). The organic layers were combined, washed with water, dried over sodium sulfate, filtered, and evaporated. The residue was crystallized from dichloromethane to give 4'-chloro-2-(2,6-difluorobenzoyl acetanilide.
• EXAMPLE 8 2-bromo-4'-chloro-2-(2-fluoro-6-methylthiobenzoyl) acetanilide A solution of 15 g. (0.075 mole) of bromoacetyl bromide in 10 ml. of benzene was added dropwise to a solution of 15 g. (0.05 mole) of 2-amino-5-chloro-2- fluoro-6'-methylthiobenzophenone in 125 ml. of benzene. The solution was heated under reflux for 3.5 hrs., and the solvents were removed under reduced pressure.
• Dichloromethane was used as the eluant and gave, after removal of solvent and recrystallization of the residue from a mixture of dichloromethane and petrol (B.P. 3060), 2-bromo-2-(2,6-difluorobenzoyl acetanilide.
• EXAMPLE 17 7-chloro-1,3-dihydro-5-(2,6-difluorophenyl)-2H- 1,4-benzodiazepin-2-one
• a solution of g. of 2-amino-4'-chloro-2'-(2,6-difiuorobenzoyl) acetanilide in 200 ml. of ethanol was heated under reflux for 24 hr. The solution was evaporated and the residue was crystallized from a small amount of methanol to give the product 7-chloro-1,3-dihydro-5-(2,6- difluorophenyl) 2H 1,4 benzodiazepin 2 one. Recrystallization from a mixture of dichloromethane/ hexane gave this product as white prisms.
• EXAMPLE 18 7-chloro-5-(2-fluoro-6-methylthiophenyl)-l,3- dihydro-2H-1,4-benzodiazepin-2-one
• a solution of 8 g. of 2-amino-4'-chloro-2'-(2-fluoro-6- methylthiobenzoyl)acetanilide in 100 ml. of n-butanol was heated under reflux for 48 hr. The butanol was removed under reduced pressure and the residue was dissolved in dichloromethane, which was washed with water, dried over anhydrous sodium sulfate and evaporated. The residue was triturated with ethanol and filtered and evaporated.
• EXAMPLE 20 7-chloro-5- (2-fiuoro-6-methoxyphenyl) -1,3-dihydro- 2H-1,4-benzodiazepin-2-one
• a solution of 8.68 g. of 2-amino-4'-chloro-2'-(Z-fiuoro- 6-methoxybenzoyl) acetanilide in 225 ml. of ethanol was heated under refiux for 17 hrs., and then evaporated to dryness under reduced pressure.
• EXAMPLE 22 7-chloro-5- (2,6-difiuorophenyl) 1-n1ethyl-1,3-dihydro- 2H-1,4-benzodiazepin-2-one
• a solution of 2:5 g. (0.008 mole) of 7-chloro-1,3-dihydro 5 (2,6-difluorophenyl)-2H-1,4-benzodiazepin-2- one in 20 ml. of N,N-dimethylformamide was treated with 2.2 ml. of a solution of sodium methoxide in methanol (0.00457 m./ml.; 0.00984 mole) and stirred at room temperature for 0.5 hr.
• EXAMPLE 24 7 chloro 5 (2,6-diflnoropl1enyl)-1-(2-dimethylaminoethyl) 1,3 dihydro-2H-1,4-benzodiazepin-2-one (and dihydrochloride)
• EXAMPLE 25 7-chloro-1-methyl-5- (2-fiuoro-6-methoxyphenyl-1,3 dihydro-ZH-1,4-benzodiazepin-2-one
• a solution of 2.7 g. (0.0085 mole) of 7-chloro-5-(2- fiuoro-6-methoxyphenyl)-1,3-dihydro 2H 1,4-benzodiazepin-Z-one in ml. of N,N-dimethylformamide was treated with 2.2 ml. of a solution of sodium methoxide in methanol (0.00469 m./ml.: 0.01 mole). The mixture was cooled in an ice bath and a solution of 0.8 ml.
• EXAMPLE 26 7-chloro-5-(2,6-difluorophenyl)-1,3,4,5-tetrahydro- 2H-1,4-benzodiazepin-2-one
• the catalyst was removed by filtration and the filtrates were made basic with ammonium hydroxide.
• EXAMPLE 27 7-chloro-1-methyl-5- (2,6-difluorophenyl)-1,3,4,5-tetrahydro-2H-1,4-benzodiazepin-2-one
• Method 1 A mixture of 3 g. (0.009 mole) of 7-chloro- 5-(2,6 difluorophenyl) 1 methyl-1,3-dihydro-2H-1,4- benzodiazepin-2-one, 40 ml. of acetic acid, ml. of water and 0.2 g. of plantinumoxide was hydrogenated at room temperature and atmospheric pressure until hydrogen uptake stopped. The catalyst was removed by filtration and the filtrate was made basic with ammonium hydroxide.
• EXAMPLE 28 7-chloro-2,3-dihydro-5-(2,6-difluorophenyl)- 1H-1,4-benzodiazepine
• a solution of 0.025 g. (0.00814 mole) of 7-chloro-1,3- dihydro-5-(2,6 difluorophenyl)-2H-1,4-benzodiazepin-2- one in 25 ml. of tetrahydrofuran was added to a solution of 0.062 g. (0.0163 mole) of lithium aluminum hydride in 25 ml. of tetrahydrofuran. The mixture was heated under reflux for 1 hr., and then allowed to stand at room temperature overnight.
• EXAMPLE 29 7-chloro-5- (2,6-difluorophenyl)-1,3-dihydro-2H-1,4- benzodiazepin-Z-one 4-oxide
• a solution of peracetic acid was prepared by cooling 10 ml. of dichloromethane to 10, adding 1.3 ml. of percent hydrogen peroxide (0.0354 mole), 1 drop of concentrated sulfuric acid followed by the dropwise addition of 3.9 g. (0.0386 mole) of acetic anhydride. The reaction mixture was stirred at 10 for 15 min. and then at room temperature for 30 min.
• the precipitate was recrystallized from a mixture of dichloromethane/hexane to give 7- chloro-S-(2.6-difluorophenyl) 3 hydroxy-1,3-dihydro- 2H-1,4-benzodiazepin-2-one as white rods.
• EXAMPLE 32 7-chloro-5- (2, d-difluorophenyl) -2-methylamino-3H- 1,4-benzodiazepine 4-oxide
• the cold stirred mixture was kept under dry nitrogen and treated by the dropwise addition of a solution of 2.9 g. of titanium tetrachloride in 50 ml.
• EXAMPLE 33 5-(2,6-difluorophenyl) -1,3-dihydro-7-nitro-2H-1,4- benzodiazepin-Z-one
• a solution of 2.0 g. (0.00735 mole) of 5-(2,6-difiuorophenyl)-1,3-dihydro-2H-1,4-benzodiazepin 2-one in 14 ml. of concentrated sulfuric acid was cooled to 30 and treated with a solution of 0.82 g. (0.0081 mole) of potassium nitrate in 8 ml. of concentrated sulfuric acid. After the addition, the mixture was stirred at room temperature for 17 hrs.
• reaction mixture was next cooled in a Dry Ice, acetone bath and treated with ice and ammonium hydroxide until the solution was basic (the internal temperature was 0 during the neutralization).
• the basic solution was extracted with dichloromethane, which was filtered, washed with saturated brine, dried 26 over sodium sulfate and evaporated. The residue was recrystallized from methanol to give 5-(2,6-difluorophenyl) 1,3 dihydro-7-nitro-2H-1,4-benzodiazepin-2-one as the methanolate as pale yellow rods.
• EXAMPLE 34 7-nitro-5-(2,6-difluorophenyl) -1-methyl-1,3-dihydro-2H- 1,4-benzodiazepin-2-one
• a solution of 1.6 g. (0.005 mole) of 5-(2,6-difluorophenyl) 1,3-dihydro-7-nitro-2H-1,4-benzodiazepin-2-one in 15 ml. of N,N-dimethylformamide was treated with 1.3 ml. of a solution of sodium methoxide in methanol (0.00469 m./ml.:0.006 mole). The mixture was stirred for 0.5 hr. when 1.42 g. (0.01 mole) of methyl iodide was added.
• Ether was used as the eluant and gave, after removal of solvent the product 5-(2,6-difiuorophenyl) 1,3-dimethyl-7-nitro-1,3-dihydro-2I-I-1,4-benzodiazepin-Z-one.
• This product was recrystallized first from a mixture of tetrahydrofuran/hexane and then from a mixture of dichloromethane/petrol (B.P. 3060) to give this product as pale yellow prisms.
• EXAMPLE 36 2-amino-5,2'-dichloro-6'-fiuorobenzophenone A solution of 62.5 g. (0.48 mole) of m-chlorofluorobenzene in ml. of dry tetrahydrofuran was added dropwise over a 20 minute period to a stirred solution of 0.5 mole of n-butyl lithium in 250 ml. of hexane and 250 ml. of tetrahydrofuran at 70, under nitrogen. Stirring was continued at 70 for one hour followed by the portionwise addition of this mixture over 20 minutes, via a tygon tube, to a stirred solution of 91.6 g. (0.47 mole) of 6-chloro-2-methyl-"3,1-benzoxazin4-one, in 750 ml. of tetrahydrofuran at 70, under nitrogen.
• EXAMPLE 39 7-chloro-5-(2-chloro-6-fluorophenyl)-1,3-dihydro- 2H-1,4-benzodiazepin-2-one
• a solution of 6.82 g. (20 mmoles) of 2-amino-4'- chloro 2' (2-chloro-6-fluorobenzoyl)acetanilide and 500 mg. of pyridine hydrochloride in 75 ml. of pyridine was refluxed for 20 hours. The pyridine was then removed under vacuo and the residue dissolved in 100 ml. of methylene chloride, washed with water, dried over anhydrous sodium sulfate and then concentrated to a volume of about 50 ml.
• EXAMPLE 40 A mixture of 63.8 g. (0.5 M) of p-chloro aniline and 114 g. (0.6 M) of p-toluenesulfonyl chloride in 400 ml. of pyridine was stirred at room temperature overnight. Most of the pyridine was then removed in vacuo. The residue was poured into 2 l. of ice-water and the tosylate extracted with ether. The ether was extracted with 1 N sodium hydroxide, aqueous hydrochloric acid, water, dried over magnesium sulfate and concentrated. The resulting oil was crystallized from ether, yielding tosy1amido-4-chlorobenzene, M.P. 119.5-120.5.
• EXAMPLE 42 61.5 g. (0.208 M) of N-methyl-tosylamido-4-chlorobenzene were added to 580 ml. of sulfuric acid (spec. gravity 1.74) at 105. The mixture was stirred, heated up to and kept at that temperature for 1 hour. After cooling, the solution was made strongly alkaline with 50 percent sodium hydroxide and the organic base extracted with ether. The organic extract was dried over potassium hydroxide pellets, concentrated and the residue distilled in vacuo to yield p-chloro-N-methylaniline, B.P. 74-75 at 0.7 mm. Hg.
• benzene was added the above acid chloride in 100 ml. benzene. Then 40ml. of pyridine was added and the mixture was stirred at room temperature for 1.5 hours, then poured into ice cold dilute hydrochloric acid and extracted with methylene chloride. The organic layer was separated, washed with water and cold dilute potassium hydroxide, dried and concentrated in vacuo to dryness. The residue was crystallized from ether producing 2,6 dichloro-N-[2-(4-chloro-N-methylanilino)ethyl]benzamide as the product. After recrystallization from acetone the product formed as colorless long prisms.
• EXAMPLE 45 7 -chloro-2,3-dihydro-5- (2,6-dichlorophenyl l-methyl-1H-1,4-benzodiazepine (A) Free base. To a solution of 26.5 g. (74 mmoles) of 2,6-dichloro-N-[2-(4 chloro-N-methyl-anilino)ethyl] benzarnide in 120' ml. of phosphorus oxychloride was added 21 g. (0.148 mole) of phosphorus pentoxide. The reaction mixture was refluxed for 6 hours and then concentrated in vacuo to a small volume. The oily residue was poured onto ice.
• EXAMPLE 46 7 -chloro-5 2,6-dichlorophenyl -1 ,3-dihydro- 1-methyl-2H-1,4-benzodiazepin-2-one
• a stirred solution of 4.4 g. (13 moles) of 7-chloro- 2,3-dihydro-5-(2, 6 dichlorophenyl) 1 methyl-1H-l,4- benzodiazepine in 60 ml. of acetic acid was added 4.2 ml. of chromate reagent at room temperature.
• the chromate reagent was prepared according to the method of E. Djerassi et al., J. Org. Chem, 21, 1547 (1946). The stirring was continued for 1.5 hours.
• EXAMPLE 48 A suppository formulation was prepared in the same manner as Example 47 except that 7-nitro-5-(2,6-difluorophenyl) -1-methyl-1,3-dihydro-2H- 1 ,4-benzodiazepin-2-one was used as the active ingredient.
• EXAMPLE 49 A suppository formulation was prepared in the same manner as Example 47 except that 7-chloro-5-(2,6-difluorophenyl)-3-hydroxy-1,3-dihydro-2H-1,4-benzodiazepin-2- one was used as the active ingredient.
• EXAMPLE 50 A suppository formulation was prepared in the same manner as Example 47 except that 7-chloro-5-(2,6-difluorophenyl)-1-methyl-1,3-dihydro-2H-1,4-benzodiazepin 2- one was used as the active ingredient.
• EXAMPLE 51 A suppository formulation was prepared in the same manner as Example 47 except that 7-chloro-1,3-dihydro- 5-(2,6 difluorophenyl)-2H-1,4-benzodiazepin-2-one was used as the active ingredient.
• EXAMPLE 5 2 A capsule formulation was prepared containing the following ingredients:
• 5-(2,6-difiuorophenyl) 1,3 dimethyl 7 nitro-l,3-dihydro-2H-1,4-benzodiaZepin-2-one was mixed with the lactose and corn starch in a suitable mixer.
• the mixture was further blended by passing through a Fitzpatrick Comminuting Machine with a No. 1A screen with knives forward.
• the blended powder was returned to the mixer, the tale added and blended thoroughly.
• the mixture was then filled into No. 4 hard shell gelatin capsules on a Parke Davis capsulating machine.
• EXAMPLE 53 A capsule was prepared in the same manner as Example 52 except that 7-nitro-5-(2,6-difiuorophenyl-l-methyl- 1,3-dihydro-2H-1,4-benzodiazepin-2-one was used as the active ingredient.
• EXAMPLE 54 A capsule was prepared in the same manner as Example 52 except that 7-chloro-5-(2,6-difluorophenyl)-3-hydroxy-1,3-dihydro-2H-1,4-benzodiazepin-2-one was used as the active ingredient.
• EXAMPLE 55 A capsule was prepared in the same manner as Example 52 except that 7-chloro-5-(2,6-difiuorophenyl)-1- methyl-1,3-dihydro-2H-1,4-benzodiazepin-2-one was used as the active ingredient.
• EXAMPLE 56 A capsule was prepared in the same manner as Example 52 except that 7-chloro-1,3-dihydro-5(2,6-difiuorophenyl)-2H-1,4-benzodiazepin-2-one was used as the active ingredient.
• EXAMPLE 57 A tablet formulation was prepared containing the following ingredients:
• 5-(2,6-difluorophenyl)-1,3-dimethy1-7 nitro-1,3-dihydro-2H-1,4-benzodiazepin-2-one was mixed with the lactose, corn starch and pregelatinized corn starch in a suitable size mixer.
• the mix was passed through a Fitzpatrick Comminuting Machine fitted with No. 1A screen and with knives forward.
• the mix was returned to the mixer and moistened with water to a thick paste.
• the moist mass was passed through a No. 12 screen and the moist granules were dried on paper lined trays at 110 F. The dried granules were returned to the mixer, the calcium stearate was added and mixed well.
• Example 58 A tablet was prepared in the same manner as Example 57 except that 7-nitro-5-(2,6-difiuorophenyl)-l-methyl-1,3-dihydro-2H-1,4-benzodiazepin-2-one was used as the active ingredient.
• EXAMPLE 59 A tablet was prepared in the same manner as Example 57 except that 7-chloro-5-(2,6-difluorophenyl)-3-hydroxy-l,3-dihydro-2H-1,4-benzodiazepin-2-one was used as the active ingredient.
• EXAMPLE 60 A tablet was prepared in the same manner as Example 57 except that 7-chloro-5-(2,6-difiuorophenyl)-1- methyl-1,3-dihydro-2H-1,4-benzodiazepin-2-one was used as the active ingredient.
• EXAMPLE 61 A tablet was prepared in the same manner as Example 57 except that 7-chloro-l,3-dihydro-5-(2,6-difiuorophenyl)-2H-1,4-benzodiazepin-2-one was used as the active ingredient.
• EXAMPLE 62 5-(2,6 difluorophenyl)-1,3-dimethyl-7-nitro-1,3-dihydro-2H-1,4-benzodiazepin-2-one was prepared in duplex ampuls, one containing the dry drug and the other containing Water for Injection, U.S.P.
• the listed materials were mixed in a suitable size glass lined tank.
• the solution was made to volume, filtered thru an 02 Selas candle filter and filled into the multiple dose vials.
• the vials were stoppered and sealed with aluminum seals.
• EXAMPLE 63 A parenteral formulation was formulated in the same manner as in Example '62 except that 7-nitro-5-(2,6-difiuorophenyl) 1 methyl 1,3 dihydro 2H 1,4 benzodiazepin-Z-one was used as the active ingredient.
• EXAMPLE 64 A parenteral formulation was formulated in the same manner as in Example 62 except that 7-chloro-5-(2,6- difluorophenyl) 3 hydroxy 1,3 dihydro 2H 1,4-
• benzodiazepin-Z-one was used as the active ingredient.
• EXAMPLE 65 A parenteral formulation was formulated in the same manner as in Example 62 except that 7-chloro-1,3-dihydro 5 (2,6 difluorophenyl) 2H 1,4 benzodiazepin-Z-one was used as the active ingredient.
• A is selected from the group consisting of B is selected from the group consisting of and CH X is a halogen; R is selected from the group consisting of hydrogen, halogen, nitro and trifiuoromethyl; R is selected from the group consisting of hydrogen, lower alkyl, lower alkanoyloxy and R is selected from the group consiting of hydrogen, hydroxy, lower alkoxy, and lower alkanoyloxy; R is selected from the group consisting of hydrogen and lower alkyl; R, is selected from the group consisting of halogen, hydroxy, lower alkoxy, lower alkyl amino, and thio-lower alkyl; R and R are selected from the group consisting of hydrogen and lower alkyl and R and R when taken together with their attached nitrogen atom form a pyrrolidino or piperidino ring; R and R are lower alkyl; n is an integer from 2 to 5 with the proviso that when R is selected from the group consisting of lower alkoxy, lower alkano
• a compound in accordance with claim 4, wherein said compound is 7-chloro-l,3-dihydro-5-(2,6-difluorophenyl)-2H-1,4-benzodiazepin-2-one.
• a compound in accordance with claim 4, wherein said compound is 7-chloro-5-(Z-dimethylamino-G-fluorophenyl)-1,3-dihydro-2H-1,4 benzodiazepin-2-one.
• a compound in accordance with claim 8, wherein said compound is 7-nitr0-5-(2,6-difiuorophenyl)-1-methyl-1,3-dihydro-2H-1,4-benzodiazepin-2-one.
• a compound in accordance with claim 8, wherein said compound is 7-chloro-5-(2,6-dichlorophenyl)-1,3-dihydro-l-methyl-ZH-1,4-benzodiazepin-2-one.
• a compound in accordance with claim 3, wherein said compound is 7-chloro-5-(2,6-difluorophenyl)-3-hydroxy-1,3-dihydro-2H-1,4-benzodiazepin-2-one.
• a compound in accordance with claim 3, wherein said compound is 7-chloro-2,3-dihydro-5-(2,6-difiuorophenyl)-1H-1,4-benzodiazepine.
• a compound in accordance with claim 3, wherein said compound is 5-(2,6-difluorophenyl)-2,3-dihydro-7- nitro-1H-1,4-benzodiazepine.
• A is selected from the group consisting of:
• R is selected from the group consisting of 0 II C
• R is selected from the group consisting of hydrogen, hydroxy, lower alkoxy and lower alkanoyloxy
• R is selected from the group consisting of hydrogen and lower alkyl
• R is selected from the group consisting of halogen, hydroxy, lower alkoxy, lower alkyl amino, and thio-lower alkyl
• R and R are selected from the group consisting of hydrogen and lower alkyl and R and R when taken together with their attached nitrogen atom form a pyrrolidino or piperidino ring
• n is an integer from 2 to 5 with the proviso that when R is selected from the group consisting of lower alkoxy, lower alkanoyloxy, and hydroxy
• A is:
• R is selected from the group consisting of hydrogen, halogen, nitro, and trifluoromethyl
• R is selected from the group consisting of hydrogen and lower alkyl
• R is selected from the group consisting of halogen, hydroxy, lower alkoxy, lower alkyl amino, and thio-lower alkyl
• X is a halogen.
• R is selected from the group consisting of hydrogen, halogen, nitro and trifluoromethyl
• R is selected from the group consisting of hydrogen, lower alkyl, lower alkanoyloxy and R is selected from the group consisting of hydrogen and lower alkyl
• R is selected from the group consisting of halogen, hydroxy, lower alkoxy, lower alkyl amino, and thio-lower alkyl
• X is a halogen
• R and R are selected from the group consisting of hydrogen and lower alkyl and R and R when taken together with their attached nitrogen atom form a pyrrolidino or piperidino ring
• n is an integer from 2 to 5.
• R is selected from the group consisting of hydro- BOND, Assistant Examiner gen, halogen, nitro and trifluoromethyl;
• X is a halogen;
• U S Cl X R R and R are lower alkyl; and
• R is selected from 15 the group consisting of hydrogen and lower alkyl.

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• 1967
  • 1967-07-03 US US650651A patent/US3523939A/en not_active Expired - Lifetime
• 1968
  • 1968-06-26 CH CH892271A patent/CH524621A/de not_active IP Right Cessation
  • 1968-06-26 CH CH952368A patent/CH512475A/de not_active IP Right Cessation
  • 1968-06-26 CH CH892371A patent/CH526558A/de not_active IP Right Cessation
  • 1968-07-01 IL IL30282A patent/IL30282A/xx unknown
  • 1968-07-01 IL IL38208A patent/IL38208A/xx unknown
  • 1968-07-01 IE IE780/68A patent/IE32217B1/xx unknown
  • 1968-07-02 GB GB44589/69A patent/GB1205996A/en not_active Expired
  • 1968-07-02 BE BE717478D patent/BE717478A/xx unknown
  • 1968-07-02 FR FR1586872D patent/FR1586872A/fr not_active Expired
  • 1968-07-02 GB GB31473/68A patent/GB1205995A/en not_active Expired
  • 1968-07-02 FR FR157490A patent/FR8488M/fr not_active Expired
  • 1968-07-03 DE DE19681770778 patent/DE1770778A1/de active Pending
  • 1968-07-03 NL NL6809403A patent/NL6809403A/xx unknown
  • 1968-07-03 CA CA024,107A patent/CA952106A/en not_active Expired
  • 1968-07-04 SE SE09170/68A patent/SE358167B/xx unknown

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